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Sealing process of turbine rotor blade cover plate top hole of gas turbine

A gas turbine and moving blade technology, which is applied in the field of the plugging process of the top hole of the cover plate of the turbine moving blade of the gas turbine, can solve the problems of low bonding strength, high cost, easy falling off, etc. high intensity effect

Inactive Publication Date: 2019-01-25
成都青石激光科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to solve the problems of high cost, low bonding strength and easy falling off during use by adopting the vacuum brazing sealing process for the top hole of the turbine moving blade cover plate of the existing gas turbine. The present invention provides a gas turbine moving blade The sealing process of the top hole of the cover plate

Method used

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  • Sealing process of turbine rotor blade cover plate top hole of gas turbine

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Effect test

Embodiment 1

[0028] A process for plugging the top hole of a gas turbine moving blade cover plate, comprising the following steps:

[0029] (1) Process the top hole to be plugged on the gas turbine moving blade cover plate made of nickel-based high-temperature-resistant material into a bell mouth shape, and the diameter decreases sequentially from the top to the bottom of the top hole;

[0030] (1) Pre-treatment of the top hole: grind the top hole to be plugged, remove the oxide layer and oil stain, and clean it;

[0031] (2) Prepare a red copper rod matched with the top hole as a liner;

[0032] (3) Install the red copper rod at the bottom of the top hole, and send the plugging alloy powder into the top hole through the coaxial carrier gas powder feeding device for laser cladding processing. The path is single-pass multi-layer, and the laser cladding process parameters are as follows: : Laser power 0.5KW, beam spot diameter 0.6mm, scanning speed 6mm / s, defocus amount 5mm, powder feeding ...

Embodiment 2

[0036] A process for plugging the top hole of a gas turbine moving blade cover plate, comprising the following steps:

[0037] (1) Process the top hole to be plugged on the gas turbine moving blade cover plate made of nickel-based high-temperature-resistant material into a bell mouth shape, and the diameter decreases sequentially from the top to the bottom of the top hole;

[0038] (1) Pre-treatment of the top hole: grind the top hole to be plugged, remove the oxide layer and oil stain, and clean it;

[0039] (2) Prepare a red copper rod matched with the top hole as a liner;

[0040] (3) Install the red copper rod at the bottom of the top hole, and send the plugging alloy powder into the top hole through the coaxial carrier gas powder feeding device for laser cladding processing. The path is single-pass multi-layer, and the laser cladding process parameters are as follows: : Laser power 1.0KW, beam spot diameter 0.9mm, scanning speed 8mm / s, defocus amount 8mm, powder feeding ...

Embodiment 3

[0044] A process for plugging the top hole of a gas turbine moving blade cover plate, comprising the following steps:

[0045] (1) Process the top hole to be plugged on the gas turbine moving blade cover plate made of nickel-based high-temperature-resistant material into a bell mouth shape, and the diameter decreases sequentially from the top to the bottom of the top hole;

[0046] (1) Pre-treatment of the top hole: grind the top hole to be plugged, remove the oxide layer and oil stain, and clean it;

[0047] (2) Prepare a red copper rod matched with the top hole as a liner;

[0048] (3) Install the red copper rod at the bottom of the top hole, and send the plugging alloy powder into the top hole through the coaxial carrier gas powder feeding device for laser cladding processing. The path is single-pass multi-layer, and the laser cladding process parameters are as follows: : Laser power 1.5KW, beam spot diameter 1.2mm, scanning speed 10mm / s, defocus amount 11mm, powder feedin...

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Abstract

The invention discloses a sealing process of a turbine rotor blade cover plate top hole of a gas turbine. The process comprises the steps that (1), top hole pre-processing is conducted; (2), a red copper bar cooperates with the top hole is prepared to be used as a lining; (3), the red copper bar is installed at the bottom of the top hole, sealing alloy powder is delivered into the top hole througha coaxial gas carrying powder delivering device to perform laser cladding process, and the path is single-passage and multi-layer; (4), the red copper bar is separated from the cover plate, and castmodification processing is conducted on the cover plate of which the top hole is sealed; (5), nondestructive examination is conducted on the cover plate on which cast modification is conducted. According to the sealing process, a traditional vacuum brazing process is abandoned, a laser cladding technology is adopted to seal the turbine rotor blade cover plate top hole of the gas turbine, metallurgical bonding is formed between the sealing alloy powder and the top hole inner wall, the bonding strength is high, the bonding does not easily fall in the using process, vacuum does not need to be ensured, the sealing cost is low, and the cladding quality is improved by multi-layer clading.

Description

technical field [0001] The invention belongs to the technical field of gas turbine blade manufacturing, and in particular relates to a sealing process for a top hole of a cover plate of a turbine moving blade of a gas turbine. Background technique [0002] Gas turbine blades include turbine moving blades, guide blades, stationary blades, etc. Most of these parts are castings. The core is fixed during casting, and some tiny holes need to be reserved on the blades. For the turbine moving blades, the top holes are usually reserved on the cover plate, and then sealed later. [0003] At present, vacuum brazing is generally used to seal the top hole of the cover plate of the turbine moving blade. Vacuum brazing requires a high degree of vacuum and special vacuum equipment, and the cost is high, and the blades sealed by vacuum brazing are The bonding strength is low, and it is easy to fall off as a whole under high temperature, high pressure and high speed. [0004] Laser claddin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F7/02
CPCB22F3/1007B22F3/105B22F7/02Y02P10/25
Inventor 鲁双伟黎作瑜阳义
Owner 成都青石激光科技有限公司
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